Acoustic Survey Tabs

Summary Results

Number of Surveys

Table 1. Summary of the number of surveys undertaken in 2022, and the number of surveys examined in the estimation of spawning stock biomass (SSB) for the Atlantic herring 4VWX stock and coastal component complexes. Numbers in brackets indicate the number of surveys excluded from total biomass estimates.

Spawning Grounds Number of Surveys Notes
Offshore Banks 0
Scots Bay 10
German Bank 6
Seal Island 7
Spectacle Buoy 5
Trinity Ledge 5
Little Hope 5 4 used
Eastern Shore 10 3 used
Glace Bay 0
Total 48

Survey Dates

Table 2. Summary of completed herring acoustic surveys in 2022 with interval (days) between surveys on the same grounds, and the number of boats with acoustic systems.

Location of Survey Survey Date Interval (days) Acoustic Boats
Scots Bay #1 2022-05-29 NA 3
Scots Bay #2 2022-06-12 14 8
Scots Bay #3 2022-06-26 14 7
Scots Bay #4 2022-07-10 14 5
Scots Bay #5 2022-07-26 16 6
Scots Bay #6 2022-08-07 12 8
Scots Bay #7 2022-08-21 14 7
Scots Bay #8 2022-09-05 15 7
Scots Bay #9 2022-09-18 13 4
Scots Bay #10 2022-10-03 15 3
Trinity Ledge #1 2022-08-02 NA 1
Trinity Ledge #2 2022-08-14 12 1
Trinity Ledge #3 2022-08-24 10 1
Trinity Ledge #4 2022-09-03 10 1
Trinity Ledge #5 2022-09-13 10 1
Spec Buoy #1 2022-08-03 NA 1
Spec Buoy #2 2022-08-15 12 1
Spec Buoy #3 2022-08-25 10 1
Spec Buoy #4 2022-09-04 10 1
Spec Buoy #5 2022-09-14 10 1
German Bank #1 2022-08-14 NA 7
German Bank #2 2022-08-28 14 9
German Bank #3 2022-09-11 14 9
German Bank #4 2022-09-25 14 7
German Bank #5 2022-10-10 15 8
German Bank #6 2022-10-23 13 5
Seal Island #1 2022-08-15 NA 7
Seal Island #2 2022-08-29 14 9
Seal Island #3 2022-09-12 14 9
Seal Island #4 2022-09-26 14 7
Seal Island #5 2022-10-11 15 8
Seal Island #6 2022-10-24 13 5
Little Hope #1 2022-09-06 NA 3
Little Hope #2 2022-09-06 0 2
Little Hope #3 2022-09-18 12 2
Little Hope #4 2022-09-18 0 2
Little Hope #5 2022-09-29 11 4
Little Hope #6 2022-09-29 0 2
Little Hope #7 2022-10-10 11 1
Little Hope #9 2022-10-21 11 1
Little Hope #8 2022-10-22 1 2
Eastern Shore #1 2022-09-19 NA 1
Eastern Shore #2 2022-09-22 3 3
Eastern Shore #3 2022-10-01 9 1
Eastern Shore #4 2022-10-04 3 3
Eastern Shore #5 2022-10-08 4 1
Eastern Shore #6 2022-10-13 5 1
Eastern Shore #7 2022-10-17 4 1
Eastern Shore #8 2022-10-18 1 1
Eastern Shore #9 2022-10-23 5 1
Eastern Shore #10 2022-10-25 2 1

SWNS/BoF Time-Series

Figure. Trends in herring SSB (adjusted for turnover) from acoustic surveys areas with 95% confidence intervals in Scots Bay (red) and German Bank (black) areas.

Figure. Acoustic index of SSB (in thousands of metric tons) (with 95% confidence intervals; black Line), the 3-year moving average (red line), the overall average since 1999 (dashed purple line), and the Limit Reference Point for the Southwest Nova Scotia/Bay of Fundy spawning component (revised 2005–2010 German Bank and Scots Bay average; dashed blue line).

Scots Bay

Summary

Table. Summary of the 2022 Scots Bay spawning ground acoustic survey data and associated biomass estimates for Main Box, North Box, and East Box areas. Adjusted biomass numbers refer to adjustment for turnover.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass
Scots Bay #1 2022-05-29 -35.5000 653 -43.72 99,092 64,962 66 99,092
Scots Bay #2 2022-06-12 -35.1534 618 -48.01 113,792 6,976 22 100,407
Scots Bay #3 2022-06-26 -35.0138 638 -48.77 29,429 14,249 53 13,709
Scots Bay #4 2022-07-10 -35.0886 524 -53.40 7,892 2,500 32 3,515
Scots Bay #5 2022-07-26 -35.2063 628 -52.61 11,402 4,440 39 10,536
Scots Bay #6 2022-08-07 -35.3048 625 -55.78 6,150 1,671 30 4,248
Scots Bay #7 2022-08-21 -35.4286 607 -56.55 4,688 1,893 40 3,656
Scots Bay #8 2022-09-05 -35.2982 626 -49.96 21,420 15,568 73 20,848
Scots Bay #9 2022-09-18 -35.1299 525 -53.71 7,283 2,800 38 0
Scots Bay #10 2022-10-03 -35.5000 406 -55.41 4,152 1,183 28 0
Summary 585 -51.79 305,300 68,962 23 256,012

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Scots Bay surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Scots Bay #9 May - 29 -35.5000
Scots Bay #1 14 Jun - 12 7 2 36 1314 268 152 -35.1534 176 -35.4118
Scots Bay #2 14 Jun - 26 8 2 33 1542 264 143 -35.0138 172 -35.3187
Scots Bay #3 14 Jul - 10 6 2 35 1068 258 139 -35.0886 187 -35.6784
Scots Bay #4 16 Jul - 26 7 2 53 1377 268 154 -35.2063 179 -35.4925
Scots Bay #5 12 Aug - 7 16 6 154 3141 265 154 -35.3048 183 -35.5900
Scots Bay #6 14 Aug - 21 8 5 117 1615 276 172 -35.4286 179 -35.4940
Scots Bay #7 15 Sep - 5 10 2 54 1978 265 154 -35.2982 182 -35.5540
Scots Bay #8 13 Sep - 18 4 1 28 602 250 131 -35.1299 186 -35.6543
Scots Bay #10 15 Oct - 3 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Scots Bay acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-05-29 BP_T04 -35.5 -45.9582 35.5174 0.7533 58,797.1203
ScotsBayMainBox 2022-05-29 MS_T03 -35.5 -59.6395 41.6189 0.0275 2,518.9932
ScotsBayMainBox 2022-05-29 MS_T01 -35.5 -58.5989 45.5298 0.0320 3,201.0206
ScotsBayMainBox 2022-05-29 MS_T02 -35.5 -55.2550 45.9700 0.0684 6,913.0646
ScotsBayMainBox 2022-05-29 SL_T03 -35.5 -60.7969 39.0103 0.0225 1,929.6625
ScotsBayMainBox 2022-05-29 SL_T02 -35.5 -53.0056 43.0649 0.1226 11,604.0771
ScotsBayMainBox 2022-05-29 SL_T01 -35.5 -52.3428 46.5981 0.1320 13,517.5545
ScotsBayNorthBox 2022-05-29 BP_T01 -35.5 -61.8149 14.8208 0.0078 203.3471
ScotsBayNorthBox 2022-05-29 BP_T02 -35.5 -60.3748 16.3323 0.0099 283.3015
ScotsBayNorthBox 2022-05-29 BP_T03 -35.5 -63.9620 18.3791 0.0038 124.0316
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-06-12 BP_T01 -35.1534 -55.4404 45.3600 0.1051 5,780.9362
ScotsBayMainBox 2022-06-12 BP_T02 -35.1534 -59.6760 39.1270 0.0460 2,179.8972
ScotsBayMainBox 2022-06-12 C1_T01 -35.1534 -57.4117 44.5137 0.0680 3,671.7312
ScotsBayMainBox 2022-06-12 C1_T02 -35.1534 -64.8455 37.5738 0.0146 662.9687
ScotsBayMainBox 2022-06-12 LB_T01 -35.1534 -57.2661 43.8370 0.0714 3,796.8780
ScotsBayMainBox 2022-06-12 LB_T02 -35.1534 -60.7796 36.9636 0.0377 1,690.7396
ScotsBayMainBox 2022-06-12 LM_T01 -35.1534 -63.2818 46.8601 0.0167 950.2966
ScotsBayMainBox 2022-06-12 LM_T02 -35.1534 -59.7090 39.8781 0.0448 2,163.3917
ScotsBayMainBox 2022-06-12 MS_T01 -35.1534 -57.7786 45.3002 0.0614 3,374.2658
ScotsBayMainBox 2022-06-12 MS_T02 -35.1534 -66.3763 38.8948 0.0099 466.0267
ScotsBayMainBox 2022-06-12 SL_T01 -35.1534 -66.9341 48.7594 0.0069 409.8531
ScotsBayMainBox 2022-06-12 SL_T02 -35.1534 -54.7151 42.3757 0.1330 6,831.6898
ScotsBayNorthBox 2022-06-13 FM_T01 -35.1534 -54.6985 14.0895 0.0519 937.1725
ScotsBayNorthBox 2022-06-13 FM_T02 -35.1534 -59.3010 15.5378 0.0163 324.7629
ScotsBayNorthBox 2022-06-13 FM_T03 -35.1534 -58.9360 17.2722 0.0160 353.2395
ScotsBayNorthBox 2022-06-13 FM_T04 -35.1534 -54.6663 18.9968 0.0388 944.1487
ScotsBayEastBox 2022-06-12 LJ_T01 -35.1534 -74.9353 12.0376 0.0005 13.6413
ScotsBayEastBox 2022-06-12 LJ_T02 -35.1534 -58.9203 14.1441 0.0179 544.9552
ScotsBayEastBox 2022-06-12 LJ_T03 -35.1534 -37.6086 16.0355 2.1301 73,710.6718
ScotsBayEastBox 2022-06-12 LJ_T04 -35.1534 -49.3074 17.9001 0.1290 4,984.8047
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-06-26 BP_T01 -35.0138 -59.0523 36.6882 0.0444 2,518.3474
ScotsBayMainBox 2022-06-26 BP_T02 -35.0138 -68.2577 36.6186 0.0053 302.3991
ScotsBayMainBox 2022-06-26 FM_T02 -35.0138 -68.8498 36.8482 0.0046 263.8573
ScotsBayMainBox 2022-06-26 FM_T01 -35.0138 -67.3165 41.1250 0.0059 375.5814
ScotsBayMainBox 2022-06-26 LB_T01 -35.0138 -58.1359 45.6856 0.0440 3,110.0064
ScotsBayMainBox 2022-06-26 LB_T02 -35.0138 -68.4755 39.2497 0.0047 287.6059
ScotsBayMainBox 2022-06-26 LJ_T01 -35.0138 -60.4027 46.6904 0.0256 1,845.3420
ScotsBayMainBox 2022-06-26 LJ_T02 -35.0138 -65.6598 39.9322 0.0089 550.0067
ScotsBayMainBox 2022-06-26 TM_T01 -35.0138 -50.6463 48.3355 0.2334 17,446.8830
ScotsBayMainBox 2022-06-26 TM_T02 -35.0138 -71.3359 41.5807 0.0023 148.8548
ScotsBayNorthBox 2022-06-26 SL_T01 -35.0138 -67.7475 19.1249 0.0019 43.9612
ScotsBayNorthBox 2022-06-26 SL_T02 -35.0138 -65.8139 17.5719 0.0032 68.6169
ScotsBayNorthBox 2022-06-26 SL_T03 -35.0138 -63.7832 16.2317 0.0055 109.5221
ScotsBayNorthBox 2022-06-26 SL_T04 -35.0138 -64.7632 14.7559 0.0049 87.3987
ScotsBayEastBox 2022-06-26 C1_T01 -35.0138 -67.8885 12.8848 0.0025 66.6910
ScotsBayEastBox 2022-06-26 C1_T02 -35.0138 -53.9636 13.9738 0.0571 1,646.4849
ScotsBayEastBox 2022-06-26 C1_T03 -35.0138 -59.1025 16.5581 0.0148 504.2815
ScotsBayEastBox 2022-06-26 C1_T04 -35.0138 -68.8535 19.2760 0.0013 53.4034
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-07-10 BP_T01 -35.0886 -57.4936 44.0331 0.0381 3,010.0643
ScotsBayMainBox 2022-07-10 BP_T02 -35.0886 -67.5793 37.6576 0.0044 295.1278
ScotsBayMainBox 2022-07-10 C1_T01 -35.0886 -63.9674 44.8124 0.0084 677.9512
ScotsBayMainBox 2022-07-10 C1_T02 -35.0886 -67.7501 37.0177 0.0043 283.7484
ScotsBayMainBox 2022-07-10 LJ_T01 -35.0886 -60.9379 47.1515 0.0161 1,361.9021
ScotsBayMainBox 2022-07-10 LJ_T02 -35.0886 -66.5417 39.3244 0.0053 374.7775
ScotsBayMainBox 2022-07-10 SL_T02 -35.0886 -59.9236 42.0586 0.0228 1,720.2104
ScotsBayEastBox 2022-07-10 LB_T01 -35.0886 -75.0119 11.9401 0.0005 13.3298
ScotsBayEastBox 2022-07-10 LB_T02 -35.0886 -72.1910 13.8148 0.0009 25.5222
ScotsBayEastBox 2022-07-10 LB_T03 -35.0886 -66.6698 16.3974 0.0026 91.0001
ScotsBayEastBox 2022-07-10 LB_T04 -35.0886 -70.3749 19.2367 0.0009 38.7726
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-07-26 BP_T01 -35.2063 -58.1584 46.5530 0.0549 3,180.0109
ScotsBayMainBox 2022-07-26 BP_T02 -35.2063 -73.5165 40.5366 0.0018 92.6014
ScotsBayMainBox 2022-07-26 C1_T01 -35.2063 -57.6045 44.4359 0.0653 3,612.6356
ScotsBayMainBox 2022-07-26 C1_T02 -35.2063 -74.8444 39.6143 0.0014 68.2072
ScotsBayMainBox 2022-07-26 LB_T01 -35.2063 -63.7082 45.0207 0.0158 886.0228
ScotsBayMainBox 2022-07-26 LB_T02 -35.2063 -73.4224 38.4371 0.0020 94.6304
ScotsBayMainBox 2022-07-26 LJ_T01 -35.2063 -58.5584 47.4701 0.0491 2,900.1945
ScotsBayMainBox 2022-07-26 LJ_T02 -35.2063 -74.7934 40.1932 0.0014 69.0121
ScotsBayMainBox 2022-07-26 SL_T01 -35.2063 -68.5249 43.7028 0.0054 292.2636
ScotsBayMainBox 2022-07-26 SL_T02 -35.2063 -73.8167 37.9688 0.0018 86.4180
ScotsBayMainBox 2022-07-26 TM_T01 -35.2063 -75.0906 42.8860 0.0012 64.4474
ScotsBayMainBox 2022-07-26 TM_T02 -35.2063 -75.7060 37.3544 0.0012 55.9328
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-08-07 C1_T01 -35.3048 -68.1048 44.6902 0.0060 328.1630
ScotsBayMainBox 2022-08-07 C1_T02 -35.3048 -74.9660 37.9451 0.0015 67.6034
ScotsBayMainBox 2022-08-07 FM_T01 -35.3048 -63.6389 44.6497 0.0169 917.6613
ScotsBayMainBox 2022-08-07 FM_T02 -35.3048 -74.9278 37.8113 0.0015 68.2012
ScotsBayMainBox 2022-08-07 LB_T01 -35.3048 -66.1720 44.3954 0.0095 512.1222
ScotsBayMainBox 2022-08-07 LB_T02 -35.3048 -76.3871 37.4871 0.0011 48.7372
ScotsBayMainBox 2022-08-07 LJ_T01 -35.3048 -60.6033 47.0387 0.0322 1,846.0445
ScotsBayMainBox 2022-08-07 LJ_T02 -35.3048 -70.9163 40.4587 0.0035 171.7690
ScotsBayMainBox 2022-08-07 LM_T01 -35.3048 -64.0628 46.3832 0.0147 832.3113
ScotsBayMainBox 2022-08-07 LM_T02 -35.3048 -73.6735 39.1110 0.0019 91.0381
ScotsBayMainBox 2022-08-07 SL_T01 -35.3048 -65.3989 50.1450 0.0100 611.9046
ScotsBayMainBox 2022-08-07 SL_T02 -35.3048 -73.0758 42.5950 0.0020 104.4686
ScotsBayNorthBox 2022-08-07 BP_T01 -35.3048 -68.8624 13.9633 0.0020 36.6608
ScotsBayNorthBox 2022-08-07 BP_T02 -35.3048 -70.1997 15.3721 0.0014 26.9443
ScotsBayNorthBox 2022-08-07 BP_T03 -35.3048 -61.1440 17.1263 0.0098 216.7897
ScotsBayNorthBox 2022-08-07 BP_T04 -35.3048 -74.2454 18.2020 0.0005 10.6145
ScotsBayEastBox 2022-08-07 MS_T01 -35.3048 -66.7984 12.7037 0.0035 95.2895
ScotsBayEastBox 2022-08-07 MS_T02 -35.3048 -71.2164 14.4100 0.0011 34.4548
ScotsBayEastBox 2022-08-07 MS_T03 -35.3048 -65.9268 17.7498 0.0031 116.4680
ScotsBayEastBox 2022-08-07 MS_T04 -35.3048 -75.6900 17.7966 0.0003 12.2995
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-08-21 BP_T01 -35.4286 -67.6116 44.8812 0.0080 367.2278
ScotsBayMainBox 2022-08-21 BP_T02 -35.4286 -73.3302 38.3390 0.0025 98.4174
ScotsBayMainBox 2022-08-21 C1_T01 -35.4286 -70.7398 46.6235 0.0037 178.6969
ScotsBayMainBox 2022-08-21 C1_T02 -35.4286 -72.0059 40.2272 0.0032 133.5078
ScotsBayMainBox 2022-08-21 FM_T01 -35.4286 -68.2250 41.9510 0.0074 318.8547
ScotsBayMainBox 2022-08-21 FM_T02 -35.4286 -73.6498 37.2106 0.0024 91.4366
ScotsBayMainBox 2022-08-21 LJ_T01 -35.4286 -68.4534 46.6451 0.0063 302.5241
ScotsBayMainBox 2022-08-21 LJ_T02 -35.4286 -71.7426 40.4234 0.0034 141.8508
ScotsBayMainBox 2022-08-21 LM_T01 -35.4286 -59.7012 47.3929 0.0468 2,269.7147
ScotsBayMainBox 2022-08-21 LM_T02 -35.4286 -73.7964 41.5610 0.0021 88.4018
ScotsBayMainBox 2022-08-21 MS_T01 -35.4286 -66.7791 47.9061 0.0091 444.8209
ScotsBayMainBox 2022-08-21 MS_T02 -35.4286 -76.3163 38.4505 0.0013 49.4844
ScotsBayMainBox 2022-08-21 SL_T01 -35.4286 -71.8733 43.8718 0.0031 137.6484
ScotsBayMainBox 2022-08-21 SL_T02 -35.4286 -75.1221 37.8342 0.0017 65.1456
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-09-05 BP_T01 -35.2982 -51.1993 42.9107 0.3550 16,085.9109
ScotsBayMainBox 2022-09-05 BP_T02 -35.2982 -70.8666 37.0533 0.0044 173.6689
ScotsBayMainBox 2022-09-05 C1_T01 -35.2982 -66.6798 49.2643 0.0088 455.4027
ScotsBayMainBox 2022-09-05 C1_T02 -35.2982 -64.3821 42.1405 0.0174 772.9843
ScotsBayMainBox 2022-09-05 FM_T01 -35.2982 -67.3474 43.5824 0.0085 390.5177
ScotsBayMainBox 2022-09-05 FM_T02 -35.2982 -74.2594 37.9448 0.0020 79.5125
ScotsBayMainBox 2022-09-05 LB_T01 -35.2982 -69.2724 45.4292 0.0052 250.6931
ScotsBayMainBox 2022-09-05 LB_T02 -35.2982 -74.2014 39.0176 0.0020 80.5823
ScotsBayMainBox 2022-09-05 LJ_T01 -35.2982 -71.1627 47.1293 0.0033 162.2229
ScotsBayMainBox 2022-09-05 LJ_T02 -35.2982 -71.6137 40.6589 0.0034 146.2194
ScotsBayMainBox 2022-09-05 LM_T01 -35.2982 -60.4222 44.3341 0.0411 1,923.7904
ScotsBayMainBox 2022-09-05 LM_T02 -35.2982 -73.8392 37.2580 0.0022 87.5909
ScotsBayMainBox 2022-09-05 SL_T01 -35.2982 -70.3806 46.4458 0.0040 194.2309
ScotsBayMainBox 2022-09-05 SL_T02 -35.2982 -65.3617 39.6212 0.0147 616.8962
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-09-18 C1_T01 -35.1299 -61.1924 49.2414 0.0179 1,300.0394
ScotsBayMainBox 2022-09-18 C1_T02 -35.1299 -72.8518 39.8485 0.0015 88.7201
ScotsBayMainBox 2022-09-18 FM_T01 -35.1299 -61.7659 43.5023 0.0178 1,139.2310
ScotsBayMainBox 2022-09-18 FM_T02 -35.1299 -57.5290 42.9803 0.0478 3,022.0332
ScotsBayMainBox 2022-09-18 MS_T01 -35.1299 -63.3956 49.9160 0.0107 782.7684
ScotsBayMainBox 2022-09-18 MS_T02 -35.1299 -66.8877 40.8760 0.0058 350.2901
ScotsBayMainBox 2022-09-18 SL_T01 -35.1299 -66.0180 48.3303 0.0060 427.9596
ScotsBayMainBox 2022-09-18 SL_T02 -35.1299 -69.9890 41.9413 0.0028 171.5143
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2022-10-03 BP_T01 -35.5 -59.4239 39.6789 0.0159 1,645.7739
ScotsBayMainBox 2022-10-03 BP_T02 -35.5 -69.5117 13.9702 0.0044 161.2848
ScotsBayMainBox 2022-10-03 C1_T01 -35.5 -63.5118 44.9994 0.0055 642.0690
ScotsBayMainBox 2022-10-03 C1_T02 -35.5 -73.9464 14.6184 0.0015 58.0927
ScotsBayMainBox 2022-10-03 FM_T01 -35.5 -59.4268 42.4235 0.0149 1,644.6949

Notes

No additional notes for this area.

German Bank

Summary

Table. Summary of the 2022 German Bank spawning ground acoustic survey data and associated biomass estimates. Adjusted biomass numbers refer to adjustment for turnover.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass
German Bank #1 2022-08-14 -35.4614 801 -51.06 22,081 6,030 27 22,081
German Bank #2 2022-08-28 -35.4513 789 -53.74 11,699 3,825 33 7,393
German Bank #3 2022-09-11 -35.3879 795 -53.64 11,902 2,006 17 8,826
German Bank #4 2022-09-25 -35.2652 811 -53.39 12,503 3,015 24 9,761
German Bank #5 2022-10-10 -34.9192 815 -50.97 20,247 5,850 29 17,675
German Bank #6 2022-10-23 -35.5000 822 -52.73 15,565 6,276 40 10,823
Summary 805 -52.59 93,996 11,735 12 76,559

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the German Bank acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during German Bank surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
German Bank #1 Aug - 14 12 3 69 2395 278 175 -35.4614 180 -35.5038
German Bank #2 14 Aug - 28 15 6 151 2969 285 184 -35.4513 174 -35.3639
German Bank #3 14 Sep - 11 11 3 81 2246 282 178 -35.3879 174 -35.3500
German Bank #4 14 Sep - 25 5 1 24 967 278 168 -35.2652 171 -35.2910
German Bank #5 15 Oct - 10 7 1 28 1299 280 157 -34.9192 157 -34.9192
German Bank #6 13 Oct - 23 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 German Bank acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-08-14 BP_T01 -35.4614 -59.1964 36.4268 0.0607 3,387.9141
German 2022-08-14 BP_T02 -35.4614 -63.8213 36.5165 0.0209 1,168.0146
German 2022-08-14 FM_T01 -35.4614 -57.0800 37.0377 0.0971 5,515.3453
German 2022-08-14 FM_T02 -35.4614 -60.8663 37.6794 0.0399 2,306.4685
German 2022-08-14 LB_T01 -35.4614 -64.3297 37.8700 0.0179 1,038.9825
German 2022-08-14 LB_T02 -35.4614 -68.1319 37.4779 0.0075 432.8999
German 2022-08-14 LJ_T01 -35.4614 -68.5936 37.0246 0.0069 389.2354
German 2022-08-14 LJ_T02 -35.4614 -71.0514 37.1901 0.0039 221.0200
German 2022-08-14 MS_T01 -35.4614 -61.3910 37.9156 0.0352 2,043.9898
German 2022-08-14 MS_T02 -35.4614 -69.9827 37.6156 0.0049 282.6875
German 2022-08-14 SL_T01 -35.4614 -67.0748 38.0065 0.0095 552.1979
German 2022-08-14 SL_T02 -35.4614 -69.9366 37.6605 0.0049 285.7072
German 2022-08-14 TM_T01 -35.4614 -59.0668 36.7753 0.0619 3,490.5659
German 2022-08-14 TM_T02 -35.4614 -64.6475 37.1194 0.0170 965.6685
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-08-28 BP_T01 -35.4513 -63.4259 36.8664 0.0293 1,257.7820
German 2022-08-28 BP_T02 -35.4513 -73.4877 36.3567 0.0029 124.0006
German 2022-08-28 C1_T01 -35.4513 -67.0376 38.8029 0.0121 547.5652
German 2022-08-28 C1_T02 -35.4513 -72.5048 38.6608 0.0035 155.4919
German 2022-08-28 FM_T01 -35.4513 -66.4861 37.3868 0.0143 621.6998
German 2022-08-28 FM_T02 -35.4513 -74.7691 37.6533 0.0021 92.3161
German 2022-08-28 LB_T01 -35.4513 -66.1046 38.4638 0.0151 678.7809
German 2022-08-28 LB_T02 -35.4513 -72.1420 37.6646 0.0039 169.0405
German 2022-08-28 LJ_T01 -35.4513 -64.7588 36.5918 0.0217 925.3531
German 2022-08-28 LJ_T02 -35.4513 -75.6545 36.9661 0.0017 75.2907
German 2022-08-28 LM_T01 -35.4513 -67.4914 37.0233 0.0114 493.2288
German 2022-08-28 LM_T02 -35.4513 -74.2874 37.3957 0.0024 103.1460
German 2022-08-28 MS_T01 -35.4513 -58.3721 38.8955 0.0889 4,026.9518
German 2022-08-28 MS_T02 -35.4513 -71.2589 38.1354 0.0047 207.1597
German 2022-08-28 SL_T01 -35.4513 -63.1110 38.9481 0.0298 1,352.3700
German 2022-08-28 SL_T02 -35.4513 -73.4317 38.4938 0.0028 125.6091
German 2022-08-28 TM_T01 -35.4513 -70.0855 36.3042 0.0064 271.4213
German 2022-08-28 TM_T02 -35.4513 -67.6860 36.5123 0.0111 471.6180
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-09-11 BP_T01 -35.3879 -62.4518 36.8983 0.0364 1,563.0356
German 2022-09-11 BP_T02 -35.3879 -65.7821 36.2047 0.0172 726.0014
German 2022-09-11 C1_T01 -35.3879 -66.3965 39.7915 0.0136 630.2264
German 2022-09-11 C1_T02 -35.3879 -70.6971 38.9632 0.0052 234.1158
German 2022-09-11 FM_T01 -35.3879 -61.9884 39.5628 0.0377 1,739.0076
German 2022-09-11 FM_T02 -35.3879 -66.8372 37.8265 0.0129 569.4076
German 2022-09-11 LB_T01 -35.3879 -67.9113 38.4444 0.0099 444.6461
German 2022-09-11 LB_T02 -35.3879 -70.6403 37.5047 0.0054 237.2003
German 2022-09-11 LJ_T01 -35.3879 -69.6077 36.2545 0.0071 300.8702
German 2022-09-11 LJ_T02 -35.3879 -68.3879 37.2212 0.0092 398.4298
German 2022-09-11 LM_T01 -35.3879 -64.8134 37.9201 0.0205 907.4147
German 2022-09-11 LM_T02 -35.3879 -70.6029 37.0648 0.0055 239.2531
German 2022-09-11 MS_T01 -35.3879 -63.6781 37.8299 0.0267 1,178.5191
German 2022-09-11 MS_T02 -35.3879 -70.1426 37.8495 0.0060 266.0053
German 2022-09-11 SL_T01 -35.3879 -63.5666 39.3971 0.0264 1,209.1622
German 2022-09-11 SL_T02 -35.3879 -69.8537 39.2777 0.0062 284.2980
German 2022-09-11 TM_T01 -35.3879 -65.5633 37.5314 0.0175 763.5125
German 2022-09-11 TM_T02 -35.3879 -71.1578 36.9902 0.0049 210.5534
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-09-25 BP_T01 -35.2652 -63.9098 36.5281 0.0199 1,108.6302
German 2022-09-25 BP_T02 -35.2652 -66.9469 36.7896 0.0098 550.9048
German 2022-09-25 C1_T01 -35.2652 -67.4753 40.0894 0.0080 487.7962
German 2022-09-25 C1_T02 -35.2652 -67.7794 39.8432 0.0075 454.8065
German 2022-09-25 LB_T01 -35.2652 -64.0345 38.7537 0.0182 1,077.2580
German 2022-09-25 LB_T02 -35.2652 -64.0619 37.8156 0.0186 1,070.4746
German 2022-09-25 LJ_T01 -35.2652 -64.9151 37.1177 0.0155 879.5385
German 2022-09-25 LJ_T02 -35.2652 -59.1581 36.9604 0.0587 3,310.9658
German 2022-09-25 LM_T01 -35.2652 -69.2555 38.1464 0.0056 323.7520
German 2022-09-25 LM_T02 -35.2652 -63.4948 37.5231 0.0213 1,219.7901
German 2022-09-25 MS_T01 -35.2652 -64.0585 39.3372 0.0179 1,071.3114
German 2022-09-25 MS_T02 -35.2652 -69.1500 39.3266 0.0055 331.7130
German 2022-09-25 TM_T01 -35.2652 -67.7607 37.1566 0.0081 456.7670
German 2022-09-25 TM_T02 -35.2652 -72.3396 36.7222 0.0028 159.1491
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-10-10 BP_T01 -34.9192 -63.6332 37.1001 0.0216 1,095.6121
German 2022-10-10 BP_T02 -34.9192 -63.9395 37.0426 0.0201 1,021.0070
German 2022-10-10 C1_T01 -34.9192 -65.0126 39.3062 0.0148 797.4885
German 2022-10-10 C1_T02 -34.9192 -67.8832 39.3465 0.0076 411.7786
German 2022-10-10 FM_T01 -34.9192 -62.5526 38.2825 0.0268 1,405.1534
German 2022-10-10 FM_T02 -34.9192 -67.6390 38.2268 0.0083 435.5965
German 2022-10-10 LB_T01 -34.9192 -64.7356 38.0729 0.0163 850.0073
German 2022-10-10 LB_T02 -34.9192 -69.4635 37.8157 0.0055 286.1744
German 2022-10-10 LJ_T01 -34.9192 -61.6112 36.9384 0.0345 1,745.2548
German 2022-10-10 LJ_T02 -34.9192 -68.6165 36.8795 0.0069 347.7986
German 2022-10-10 LM_T01 -34.9192 -62.3885 37.8711 0.0282 1,459.2633
German 2022-10-10 LM_T02 -34.9192 -64.4543 37.2569 0.0178 906.8768
German 2022-10-10 SL_T01 -34.9192 -66.4096 28.3523 0.0149 578.1266
German 2022-10-10 SL_T02 -34.9192 -55.7806 39.2386 0.1245 6,682.2096
German 2022-10-10 TM_T01 -34.9192 -60.9078 36.6300 0.0409 2,052.0902
German 2022-10-10 TM_T02 -34.9192 -71.6601 37.1825 0.0034 172.5711
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2022-10-23 LB_T02 -35.5 -69.3526 37.6212 0.0042 338.3832
German 2022-10-23 LB_T01 -35.5 -62.5442 38.3766 0.0196 1,622.7440
German 2022-10-23 LJ_T01 -35.5 -65.4845 37.0390 0.0103 824.5524
German 2022-10-23 LJ_T02 -35.5 -67.0280 36.9878 0.0072 577.9273
German 2022-10-23 LM_T01 -35.5 -56.1942 38.1130 0.0850 7,002.4552
German 2022-10-23 LM_T02 -35.5 -71.9577 37.7431 0.0023 185.7393
German 2022-10-23 SL_T01 -35.5 -61.9030 41.1179 0.0212 1,880.9252
German 2022-10-23 SL_T02 -35.5 -64.2726 39.2867 0.0128 1,089.9613
German 2022-10-23 TM_T01 -35.5 -67.2000 36.7530 0.0070 555.4857
German 2022-10-23 TM_T02 -35.5 -62.9229 36.8882 0.0186 1,487.2376

Notes

No additional notes for this area.

Seal Island

Summary

Table. Summary of the 2022 Seal Island spawning ground acoustic survey data and associated biomass estimates.

Location Date Interval (Days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Seal Island #1 2022-08-15 -35.1441 269 -56.47 2,020 730 36
Seal Island #2 2022-08-29 14 -35.5000 271 -62.26 570 144 25
Seal Island #3 2022-09-12 14 -35.5000 267 -51.71 6,392 1,241 19
Seal Island #4 2022-09-26 14 -35.5000 272 -54.13 3,732 507 14
Seal Island #5 2022-10-11 15 -35.5000 252 -52.02 5,604 2,084 37
Seal Island #6 2022-10-24 13 -35.5000 285 -54.91 3,260 1,123 34
Summary 269 -55.25 21,577 2,820 13

Length Frequency

Figure. Length distribution used for calculation of TS for the Seal Island acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Seal Island surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Seal Island #3 Aug - 14 -35.5000
Seal Island #4 14 Aug - 28 -35.5000
Seal Island #5 14 Sep - 11 -35.5000
Seal Island #1 14 Sep - 25 20 4 113 3917 275 160 -35.1441 169 -35.2326
Seal Island #2 15 Oct - 10 9 2 50 1619 275 155 -35.0151 164 -35.1093
Seal Island #6 13 Oct - 23 -35.5000
Seal Island #7 10 Nov - 2 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Seal Island acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Seal Island acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-08-15 BP_T03 -35.1441 -67.2614 28.1457 0.0043 164.9750
SealIsland 2022-08-15 FM_T03 -35.5000 -74.2887 28.2709 0.0009 35.5045
SealIsland 2022-08-15 LB_T03 -35.1441 -65.4769 27.6912 0.0066 248.8129
SealIsland 2022-08-15 LJ_T03 -35.5000 -63.4721 27.9571 0.0113 428.4944
SealIsland 2022-08-15 MS_T03 -35.1441 -66.0816 28.5644 0.0056 216.4712
SealIsland 2022-08-15 SL_T03 -35.5000 -70.4895 28.8036 0.0022 85.1530
SealIsland 2022-08-15 TM_T03 -35.1441 -60.1873 28.1399 0.0220 841.0764
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-08-29 BP_T03 -35.5 -74.9950 28.1833 0.0010 30.3886
SealIsland 2022-08-29 C1_T03 -35.5 -73.3853 29.7973 0.0014 44.0234
SealIsland 2022-08-29 FM_T03 -35.5 -72.7741 28.6862 0.0017 50.6757
SealIsland 2022-08-29 LB_T03 -35.5 -67.9773 28.3469 0.0051 152.9265
SealIsland 2022-08-29 LJ_T03 -35.5 -76.4578 28.1502 0.0007 21.6988
SealIsland 2022-08-29 LM_T03 -35.5 -70.3303 29.0736 0.0029 88.9580
SealIsland 2022-08-29 MS_T03 -35.5 -75.9512 29.0100 0.0008 24.3834
SealIsland 2022-08-29 SL_T03 -35.5 -74.0945 28.2707 0.0013 37.3903
SealIsland 2022-08-29 TM_T03 -35.5 -69.0422 26.5391 0.0043 119.6725
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-09-12 BP_T03 -35.5 -58.1824 27.6179 0.0506 1,440.7965
SealIsland 2022-09-12 C1_T03 -35.5 -59.5923 29.3664 0.0344 1,041.3723
SealIsland 2022-09-12 FM_T03 -35.5 -59.8914 28.7508 0.0328 972.0724
SealIsland 2022-09-12 LB_T03 -35.5 -64.0900 28.7408 0.0125 369.6887
SealIsland 2022-09-12 LJ_T03 -35.5 -62.9965 28.6585 0.0161 475.5431
SealIsland 2022-09-12 LM_T03 -35.5 -60.1652 28.9992 0.0305 912.6864
SealIsland 2022-09-12 MS_T03 -35.5 -63.9352 28.6605 0.0130 383.1035
SealIsland 2022-09-12 SL_T03 -35.5 -66.3146 30.2763 0.0071 221.5012
SealIsland 2022-09-12 TM_T03 -35.5 -62.1712 27.9936 0.0199 575.0686
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-09-26 BP_T03 -35.5 -61.0742 27.5668 0.0204 754.5812
SealIsland 2022-09-26 C1_T03 -35.5 -65.6606 30.7182 0.0064 262.4608
SealIsland 2022-09-26 LB_T03 -35.5 -63.1012 29.1022 0.0121 473.1576
SealIsland 2022-09-26 LJ_T03 -35.5 -62.2494 28.7511 0.0149 575.6879
SealIsland 2022-09-26 LM_T03 -35.5 -63.6350 29.1618 0.0107 418.4331
SealIsland 2022-09-26 MS_T03 -35.5 -61.0027 29.4231 0.0194 767.0960
SealIsland 2022-09-26 TM_T03 -35.5 -63.0359 28.3095 0.0126 480.3206
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-10-11 BP_T03 -35.5 -66.6097 27.5341 0.0064 194.8416
SealIsland 2022-10-11 C1_T03 -35.5 -61.8108 29.1762 0.0184 588.2641
SealIsland 2022-10-11 FM_T03 -35.5 -55.4842 29.5604 0.0778 2,524.8621
SealIsland 2022-10-11 LB_T03 -35.5 -60.5365 28.6678 0.0251 788.8663
SealIsland 2022-10-11 LJ_T03 -35.5 -62.0663 28.7626 0.0176 554.6545
SealIsland 2022-10-11 LM_T03 -35.5 -65.8474 28.1523 0.0075 232.2283
SealIsland 2022-10-11 SL_T03 -35.5 -64.8019 28.9997 0.0093 295.4385
SealIsland 2022-10-11 TM_T03 -35.5 -63.2278 28.3651 0.0136 424.4927
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2022-10-24 LB_T03 -35.5 -69.4656 28.8858 0.0020 114.2765
SealIsland 2022-10-24 LJ_T03 -35.5 -59.1667 28.6807 0.0219 1,224.1804
SealIsland 2022-10-24 LM_T03 -35.5 -59.5461 29.2214 0.0197 1,121.7703
SealIsland 2022-10-24 SL_T03 -35.5 -63.3633 30.4152 0.0079 465.7826
SealIsland 2022-10-24 TM_T03 -35.5 -64.8122 29.1275 0.0059 333.6498

Notes

No additional notes for this area.

Trinity Ledge

Summary

Table. Summary of the 2022 Trinity Ledge spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Trinity Ledge #1 2022-08-02 -35.9878 15 -52.74 313 405 129
Trinity Ledge #2 2022-08-14 12 -36.0912 10 -40.05 4,009 1,863 46
Trinity Ledge #3 2022-08-24 10 -35.9495 13 -43.31 2,471 1,635 66
Trinity Ledge #4 2022-09-03 10 -35.9495 10 -43.12 1,934 1,150 59
Trinity Ledge #5 2022-09-13 10 -35.9495 2 -32.37 9,040 2,099 55
Summary 10 -42.32 17,766 5,304 30

Length Frequency

Figure. Length distribution used for calculation of TS for the Trinity Ledge acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Trinity Ledge surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Trinity Ledge #1 Aug - 2 1 1 25 74 281 182 -35.5384 180 -35.5183
Trinity Ledge #2 12 Aug - 14 1 1 25 70 275 179 -35.6417 189 -35.7261
Trinity Ledge #3 10 Aug - 24 1 1 30 111 270 164 -35.4333 187 -35.6649
Trinity Ledge #4 10 Sep - 3 -35.5000
Trinity Ledge #5 10 Sep - 13 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Trinity Ledge acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Trinity Ledge acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2022-08-02 DD_T10 -35.9878 -69.2841 3.1082 0.0057 6.9247
TrinityLedgeTR1 2022-08-02 DD_T09 -35.9878 -83.5626 4.3008 0.0002 0.2586
TrinityLedgeTR1 2022-08-02 DD_T08 -35.9878 -71.1044 4.2184 0.0028 4.5537
TrinityLedgeTR1 2022-08-02 DD_T07 -35.9878 -67.5022 4.0188 0.0067 10.4373
TrinityLedgeTR1 2022-08-02 DD_T06 -35.9878 -91.3025 3.8053 0.0000 0.0435
TrinityLedgeTR1 2022-08-02 DD_T05 -35.9878 -80.9343 3.9825 0.0003 0.4736
TrinityLedgeTR1 2022-08-02 DD_T04 -35.9878 -80.0762 4.5808 0.0003 0.5770
TrinityLedgeTR1 2022-08-02 DD_T03 -35.9878 -53.0725 2.6970 0.2754 289.4392
TrinityLedgeTR1 2022-08-02 DD_T02 -35.9878 -89.4151 4.1112 0.0000 0.0672
TrinityLedgeTR1 2022-08-02 DD_T01 -35.9878 -98.1779 3.1328 0.0000 0.0089
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2022-08-14 DD_T01 -36.0912 -Inf 2.2925 0.0000 0.0000
TrinityLedgeTR1 2022-08-14 DD_T02 -36.0912 -56.9571 3.5003 0.0792 81.7623
TrinityLedgeTR1 2022-08-14 DD_T03 -36.0912 -67.2737 3.7943 0.0068 7.6014
TrinityLedgeTR1 2022-08-14 DD_T04 -36.0912 -48.5981 4.1016 0.4632 560.3385
TrinityLedgeTR1 2022-08-14 DD_T05 -36.0912 -44.4080 4.3440 1.1477 1,470.4892
TrinityLedgeTR1 2022-08-14 DD_T06 -36.0912 -43.3558 4.4147 1.4389 1,873.6179
TrinityLedgeTR1 2022-08-14 DD_T07 -36.0912 -64.8188 4.4505 0.0102 13.3778
TrinityLedgeTR1 2022-08-14 DD_T08 -36.0912 -74.7436 4.3026 0.0011 1.3611
TrinityLedgeTR1 2022-08-14 DD_T09 -36.0912 -Inf 2.6381 0.0000 0.0000
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2022-08-24 DD_T01 -35.9495 -93.1774 4.4244 0.0000 0.0255
TrinityLedgeTR1 2022-08-24 DD_T02 -35.9495 -82.1573 4.8336 0.0001 0.3225
TrinityLedgeTR1 2022-08-24 DD_T03 -35.9495 -83.9546 4.8949 0.0001 0.2132
TrinityLedgeTR1 2022-08-24 DD_T04 -35.9495 -70.8628 5.0396 0.0019 4.3450
TrinityLedgeTR1 2022-08-24 DD_T05 -35.9495 -44.9347 4.3903 0.8709 1,701.3664
TrinityLedgeTR1 2022-08-24 DD_T06 -35.9495 -51.7270 3.5912 0.2228 356.0932
TrinityLedgeTR1 2022-08-24 DD_T07 -35.9495 -51.1313 3.0937 0.2967 408.4507
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2022-09-03 DD_T01 -35.9495 -80.4330 2.7553 0.0004 0.3593
TrinityLedgeTR1 2022-09-03 DD_T02 -35.9495 -87.8001 2.9508 0.0001 0.0659
TrinityLedgeTR1 2022-09-03 DD_T03 -35.9495 -94.1816 3.0437 0.0000 0.0152
TrinityLedgeTR1 2022-09-03 DD_T04 -35.9495 -75.5221 3.5645 0.0009 1.1131
TrinityLedgeTR1 2022-09-03 DD_T05 -35.9495 -45.7180 3.5104 0.8873 1,064.0259
TrinityLedgeTR1 2022-09-03 DD_T06 -35.9495 -46.6853 3.8763 0.6431 851.5766
TrinityLedgeTR1 2022-09-03 DD_T07 -35.9495 -63.7959 3.9342 0.0123 16.5639
TrinityLedgeTR1 2022-09-03 DD_T08 -35.9495 -82.1398 3.9692 0.0002 0.2425
TrinityLedgeTR1 2022-09-03 DD_T09 -35.9495 -89.2586 1.9268 0.0001 0.0471
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2022-09-13 DD_T01 -35.9495 -38.0996 1.1089 2.5177 1,020.9667
TrinityLedgeTR1 2022-09-13 DD_T02 -35.9495 -34.0709 1.2782 5.5230 2,581.6026
TrinityLedgeTR1 2022-09-13 DD_T03 -35.9495 -44.9160 1.1496 0.5055 212.5098
TrinityLedgeTR1 2022-09-13 DD_T04 -35.9495 -92.1631 1.0438 0.0000 0.0040
TrinityLedgeTR2 2022-09-13 DD_T05 -35.9495 -86.9903 5.3396 0.0000 0.0949
TrinityLedgeTR2 2022-09-13 DD_T06 -35.9495 -93.3593 4.2706 0.0000 0.0219
TrinityLedgeTR2 2022-09-13 DD_T07 -35.9495 -92.7304 4.3014 0.0000 0.0253
TrinityLedgeTR2 2022-09-13 DD_T08 -35.9495 -43.0337 3.8118 1.3118 2,361.3186
TrinityLedgeTR2 2022-09-13 DD_T09 -35.9495 -42.1971 3.3909 1.7880 2,862.9746
TrinityLedgeTR2 2022-09-13 DD_T11 -35.9495 -84.1419 4.4381 0.0001 0.1830

Notes

No additional notes for this area.

Spectacle Buoy

Summary

Table. Summary of the 2022 Spectacle Buoy spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Spectacle Buoy #1 2022-08-03 -35.9495 40 -59.40 181 81 45
Spectacle Buoy #2 2022-08-15 12 -35.9495 35 -60.18 133 65 49
Spectacle Buoy #3 2022-08-25 10 -35.8963 34 -54.21 495 373 75
Spectacle Buoy #4 2022-09-04 10 -35.7921 28 -38.62 14,393 13,192 92
Spectacle Buoy #5 2022-09-14 10 -35.9495 34 -53.54 592 343 58
Summary 34 -53.19 15,794 13,202 84

Length Frequency

Figure. Length distribution used for calculation of TS for the Spectacle Buoy acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Spectacle Buoy surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target SSPength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Spec. Buoy #1 Aug - 3 -35.5000
Spec. Buoy #2 12 Aug - 15 -35.5000
Spec. Buoy #3 10 Aug - 25 1 1 11 12 260 147 -35.2840 184 -35.6012
Spec. Buoy #4 10 Sep - 4 2 2 50 124 265 155 -35.3427 183 -35.5886
Spec. Buoy #5 10 Sep - 14 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Spectacle Buoy acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Spectacle Buoy acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2022-08-03 DD_T01 -35.9495 -85.8169 11.3763 0.0001 0.4129
SpecBuoySP1 2022-08-03 DD_T02 -35.9495 -106.2431 12.1046 0.0000 0.0037
SpecBuoySP1 2022-08-03 DD_T03 -35.9495 -75.9387 13.6885 0.0005 4.0149
SpecBuoySP1 2022-08-03 DD_T04 -35.9495 -63.2349 12.3103 0.0109 74.8259
SpecBuoySP1 2022-08-03 DD_T05 -35.9495 -65.2291 11.3174 0.0075 47.2745
SpecBuoySP1 2022-08-03 DD_T06 -35.9495 -64.6114 11.2823 0.0087 54.5010
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2022-08-15 DD_T07 -35.9495 -103.0657 7.0813 0.0000 0.0068
SpecBuoySP1 2022-08-15 DD_T06 -35.9495 -69.9328 13.5894 0.0025 14.0752
SpecBuoySP1 2022-08-15 DD_T05 -35.9495 -63.0185 13.6765 0.0123 69.1660
SpecBuoySP1 2022-08-15 DD_T04 -35.9495 -64.8231 14.0491 0.0079 45.6490
SpecBuoySP1 2022-08-15 DD_T03 -35.9495 -76.1417 14.1600 0.0006 3.3695
SpecBuoySP1 2022-08-15 DD_T02 -35.9495 -86.1289 12.8485 0.0001 0.3379
SpecBuoySP1 2022-08-15 DD_T01 -35.9495 -85.9647 10.4057 0.0001 0.3510
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2022-08-25 DD_T06 -35.8963 -81.9459 12.5615 0.0002 0.8343
SpecBuoySP1 2022-08-25 DD_T05 -35.8963 -55.4081 12.5709 0.0677 375.9260
SpecBuoySP1 2022-08-25 DD_T04 -35.8963 -60.4755 12.9460 0.0205 117.0468
SpecBuoySP1 2022-08-25 DD_T03 -35.8963 -89.8719 12.3002 0.0000 0.1345
SpecBuoySP1 2022-08-25 DD_T02 -35.8963 -101.9721 12.3641 0.0000 0.0083
SpecBuoySP1 2022-08-25 DD_T01 -35.8963 -80.0675 13.3650 0.0002 1.2858
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2022-09-04 DD_T01 -35.7921 -88.1074 9.3015 0.0000 0.1621
SpecBuoySP1 2022-09-04 DD_T02 -35.7921 -Inf 10.1212 0.0000 0.0000
SpecBuoySP1 2022-09-04 DD_T03 -35.7921 -38.7965 11.0770 2.8864 13,831.7906
SpecBuoySP1 2022-09-04 DD_T04 -35.7921 -52.8754 11.1306 0.1123 540.7399
SpecBuoySP1 2022-09-04 DD_T05 -35.7921 -67.4197 11.3044 0.0039 18.9914
SpecBuoySP1 2022-09-04 DD_T06 -35.7921 -79.4032 10.9236 0.0003 1.2028
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2022-09-14 DD_T01 -35.9495 -85.6466 10.0403 0.0001 0.3648
SpecBuoySP1 2022-09-14 DD_T02 -35.9495 -76.4151 10.1431 0.0005 3.0567
SpecBuoySP1 2022-09-14 DD_T03 -35.9495 -58.1995 11.5244 0.0306 202.6830
SpecBuoySP1 2022-09-14 DD_T04 -35.9495 -55.4032 11.4352 0.0587 385.8707
SpecBuoySP1 2022-09-14 DD_T05 -35.9495 -Inf 10.0192 0.0000 0.0000
SpecBuoySP1 2022-09-14 DD_T06 -35.9495 -Inf 6.0699 0.0000 0.0000

Notes

No additional notes for this area.

Little Hope

Summary

Table. Summary of the 2022 Little Hope spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Little Hope #1 2022-09-06 -35.2866 37 -42.01 20,263 905 12
Little Hope #2 2022-09-18 12 -35.2680 4 -40.10 1,760 400 33
Little Hope #3 2022-09-29 11 -35.3193 1 -36.18 18,933 521 45
Little Hope #4 2022-10-21 22 -35.1695 100 -58.85 427 121 28
Summary 35 -44.29 41,383 4,653 11

Length Frequency

Figure. Length distribution used for calculation of TS for the Little Hope acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Little Hope surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Little Hope by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target SLHength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Little Hope #1 Sep - 7 1 1 30 101 274 148 -34.8372 161 -35.0252
Little Hope #2 12 Sep - 19 1 1 28 100 272 145 -34.8185 162 -35.0414
Little Hope #3 11 Sep - 30 1 1 28 100 272 147 -34.8698 162 -35.0446
Little Hope #4 11 Oct - 11 1 1 29 103 270 137 -34.6283 154 -34.8447
Little Hope #5 11 Oct - 22 1 1 28 102 270 140 -34.7200 157 -34.9219

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Little Hope acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Little Hope acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-06 SH_T01 -35.2866 -51.6159 8.0385 0.1724 857.2504
LittleHopeLH1 2022-09-06 SH_T02 -35.2866 -50.1606 8.0269 0.2414 1,198.4850
LittleHopeLH1 2022-09-06 SH_T03 -35.2866 -52.2508 7.9871 0.1499 740.6498
LittleHopeLH1 2022-09-06 SH_T04 -35.2866 -52.9931 8.0324 0.1257 624.2926
LittleHopeLH1 2022-09-06 SH_T05 -35.2866 -49.4863 7.2883 0.3105 1,399.8099
LittleHopeLH1 2022-09-06 SH_T06 -35.2866 -49.3618 6.9242 0.3364 1,440.5108
LittleHopeLH1 2022-09-06 SH_T07 -35.2866 -53.5450 5.7937 0.1534 549.7901
LittleHopeLH1 2022-09-06 SH_T08 -35.2866 -51.9932 5.4526 0.2330 785.9109
LittleHopeLH1 2022-09-06 SH_T09 -35.2866 -57.4003 1.9832 0.1845 226.2912
LittleHopeLH2 2022-09-07 SH_T10 -35.2866 -51.7988 7.5533 0.1030 573.9200
LittleHopeLH2 2022-09-07 SH_T11 -35.2866 -52.7127 7.9292 0.0795 465.0069
LittleHopeLH2 2022-09-07 SH_T12 -35.2866 -49.3427 7.8290 0.1749 1,010.3157
LittleHopeLH2 2022-09-07 SH_T13 -35.2866 -50.4128 7.4897 0.1429 789.6774
LittleHopeLH2 2022-09-07 SH_T14 -35.2866 -53.2202 4.0349 0.1389 413.7282
LittleHopeLH3 2022-09-07 BT_T01 -35.2866 -56.5719 0.9101 0.1743 62.1528
LittleHopeLH3 2022-09-07 BT_T02 -35.2866 -55.8805 1.2121 0.1535 72.8788
LittleHopeLH3 2022-09-07 BT_T03 -35.2866 -53.2422 1.2080 0.2827 133.7925
LittleHopeLH3 2022-09-07 BT_T04 -35.2866 -55.6067 1.8481 0.1072 77.6204
LittleHopeLH3 2022-09-07 BT_T05 -35.2866 -52.7127 2.2352 0.1726 151.1373
LittleHopeLH3 2022-09-07 BT_T06 -35.2866 -52.0956 2.8660 0.1552 174.2157
LittleHopeLH3 2022-09-07 BT_T07 -35.2866 -52.5331 2.9886 0.1345 157.5193
LittleHopeLH3 2022-09-07 BT_T08 -35.2866 -53.6396 2.1468 0.1452 122.0932
LittleHopeLH3 2022-09-07 BT_T09 -35.2866 -51.8994 2.6525 0.1754 182.2658
LittleHopeLH3 2022-09-07 BT_T10 -35.2866 -53.2101 2.2315 0.1542 134.7832
LittleHopeLH3 2022-09-07 BT_T11 -35.2866 -60.6533 1.0287 0.0603 24.2837
LittleHopeLH4 2022-09-07 BT_T12 -35.2866 -50.3360 2.2899 0.1458 116.8374
LittleHopeLH4 2022-09-07 BT_T13 -35.2866 -48.8262 2.1711 0.2177 165.4079
LittleHopeLH4 2022-09-07 BT_T14 -35.2866 -52.7687 1.7752 0.1074 66.7281
LittleHopeLH4 2022-09-07 BT_T15 -35.2866 -48.7304 1.8945 0.2551 169.0986
LittleHopeLH4 2022-09-07 BT_T16 -35.2866 -51.7819 1.4643 0.1634 83.7510
LittleHopeLH4 2022-09-07 BT_T17 -35.2866 -54.0712 1.0841 0.1303 49.4375
LittleHopeLH5 2022-09-06 AS_T01 -35.2866 -47.3045 5.0383 0.1670 265.8286
LittleHopeLH5 2022-09-06 AS_T02 -35.2866 -49.8730 4.6989 0.0991 147.1485
LittleHopeLH5 2022-09-06 AS_T03 -35.2866 -48.3574 3.6566 0.1806 208.5990
LittleHopeLH6 2022-09-06 AS_T04 -35.2866 -57.3540 1.9843 0.1751 84.3099
LittleHopeLH6 2022-09-06 AS_T05 -35.2866 -51.5893 2.7357 0.4790 317.9387
LittleHopeLH6 2022-09-06 AS_T06 -35.2866 -51.5430 2.7855 0.4755 321.3489
LittleHopeLH6 2022-09-06 AS_T07 -35.2866 -47.8864 3.5313 0.8705 745.8189
LittleHopeLH6 2022-09-06 AS_T08 -35.2866 -50.4817 3.3196 0.5095 410.2997
LittleHopeLH6 2022-09-06 AS_T09 -35.2866 -49.5117 3.8969 0.5426 512.9862
LittleHopeLH6 2022-09-06 AS_T10 -35.2866 -47.0190 3.9094 0.9602 910.6937
LittleHopeLH6 2022-09-06 AS_T11 -35.2866 -43.6366 4.4005 1.8587 1,984.3421
LittleHopeLH6 2022-09-06 AS_T12 -35.2866 -46.0836 7.0946 0.6563 1,129.5810
LittleHopeLH6 2022-09-06 AS_T13 -35.2866 -46.8819 7.3691 0.5257 939.9131
LittleHopeLH6 2022-09-06 AS_T14 -35.2866 -47.4978 7.6282 0.4407 815.6254
LittleHopeLH6 2022-09-06 AS_T15 -35.2866 -50.6738 7.2821 0.2222 392.5475
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-06 SH_T01 -35.2866 -51.6159 8.0385 0.1724 857.2504
LittleHopeLH1 2022-09-06 SH_T02 -35.2866 -50.1606 8.0269 0.2414 1,198.4850
LittleHopeLH1 2022-09-06 SH_T03 -35.2866 -52.2508 7.9871 0.1499 740.6498
LittleHopeLH1 2022-09-06 SH_T04 -35.2866 -52.9931 8.0324 0.1257 624.2926
LittleHopeLH1 2022-09-06 SH_T05 -35.2866 -49.4863 7.2883 0.3105 1,399.8099
LittleHopeLH1 2022-09-06 SH_T06 -35.2866 -49.3618 6.9242 0.3364 1,440.5108
LittleHopeLH1 2022-09-06 SH_T07 -35.2866 -53.5450 5.7937 0.1534 549.7901
LittleHopeLH1 2022-09-06 SH_T08 -35.2866 -51.9932 5.4526 0.2330 785.9109
LittleHopeLH1 2022-09-06 SH_T09 -35.2866 -57.4003 1.9832 0.1845 226.2912
LittleHopeLH2 2022-09-07 SH_T10 -35.2866 -51.7988 7.5533 0.1030 573.9200
LittleHopeLH2 2022-09-07 SH_T11 -35.2866 -52.7127 7.9292 0.0795 465.0069
LittleHopeLH2 2022-09-07 SH_T12 -35.2866 -49.3427 7.8290 0.1749 1,010.3157
LittleHopeLH2 2022-09-07 SH_T13 -35.2866 -50.4128 7.4897 0.1429 789.6774
LittleHopeLH2 2022-09-07 SH_T14 -35.2866 -53.2202 4.0349 0.1389 413.7282
LittleHopeLH5 2022-09-06 AS_T01 -35.2866 -47.3045 5.0383 0.1670 265.8286
LittleHopeLH5 2022-09-06 AS_T02 -35.2866 -49.8730 4.6989 0.0991 147.1485
LittleHopeLH5 2022-09-06 AS_T03 -35.2866 -48.3574 3.6566 0.1806 208.5990
LittleHopeLH6 2022-09-06 AS_T04 -35.2866 -57.3540 1.9843 0.1751 84.3099
LittleHopeLH6 2022-09-06 AS_T05 -35.2866 -51.5893 2.7357 0.4790 317.9387
LittleHopeLH6 2022-09-06 AS_T06 -35.2866 -51.5430 2.7855 0.4755 321.3489
LittleHopeLH6 2022-09-06 AS_T07 -35.2866 -47.8864 3.5313 0.8705 745.8189
LittleHopeLH6 2022-09-06 AS_T08 -35.2866 -50.4817 3.3196 0.5095 410.2997
LittleHopeLH6 2022-09-06 AS_T09 -35.2866 -49.5117 3.8969 0.5426 512.9862
LittleHopeLH6 2022-09-06 AS_T10 -35.2866 -47.0190 3.9094 0.9602 910.6937
LittleHopeLH6 2022-09-06 AS_T11 -35.2866 -43.6366 4.4005 1.8587 1,984.3421
LittleHopeLH6 2022-09-06 AS_T12 -35.2866 -46.0836 7.0946 0.6563 1,129.5810
LittleHopeLH6 2022-09-06 AS_T13 -35.2866 -46.8819 7.3691 0.5257 939.9131
LittleHopeLH6 2022-09-06 AS_T14 -35.2866 -47.4978 7.6282 0.4407 815.6254
LittleHopeLH6 2022-09-06 AS_T15 -35.2866 -50.6738 7.2821 0.2222 392.5475
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-18 AS_T01 -35.268 -44.4443 1.7798 0.8124 442.9825
LittleHopeLH1 2022-09-18 AS_T02 -35.268 -47.0253 1.9960 0.3998 244.5057
LittleHopeLH1 2022-09-18 AS_T03 -35.268 -47.1082 1.8695 0.4188 239.8814
LittleHopeLH1 2022-09-18 AS_T04 -35.268 -49.7583 2.2244 0.1912 130.3147
LittleHopeLH1 2022-09-18 AS_T05 -35.268 -51.3469 2.1287 0.1386 90.3910
LittleHopeLH1 2022-09-18 AS_T06 -35.268 -53.4873 1.9625 0.0918 55.2187
LittleHopeLH2 2022-09-19 SH_T01 -35.268 -53.3833 1.7182 0.1072 88.2349
LittleHopeLH2 2022-09-19 SH_T02 -35.268 -55.7773 1.9098 0.0556 50.8441
LittleHopeLH2 2022-09-19 SH_T03 -35.268 -53.9455 1.6052 0.1008 77.5212
LittleHopeLH2 2022-09-19 SH_T04 -35.268 -51.2679 2.1473 0.1396 143.6091
LittleHopeLH2 2022-09-19 SH_T05 -35.268 -51.7021 2.6554 0.1022 129.9453
LittleHopeLH2 2022-09-19 SH_T06 -35.268 -54.6018 1.8994 0.0733 66.6485
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-18 AS_T01 -35.268 -44.4443 1.7798 0.8124 442.9825
LittleHopeLH1 2022-09-18 AS_T02 -35.268 -47.0253 1.9960 0.3998 244.5057
LittleHopeLH1 2022-09-18 AS_T03 -35.268 -47.1082 1.8695 0.4188 239.8814
LittleHopeLH1 2022-09-18 AS_T04 -35.268 -49.7583 2.2244 0.1912 130.3147
LittleHopeLH1 2022-09-18 AS_T05 -35.268 -51.3469 2.1287 0.1386 90.3910
LittleHopeLH1 2022-09-18 AS_T06 -35.268 -53.4873 1.9625 0.0918 55.2187
LittleHopeLH2 2022-09-19 SH_T01 -35.268 -53.3833 1.7182 0.1072 88.2349
LittleHopeLH2 2022-09-19 SH_T02 -35.268 -55.7773 1.9098 0.0556 50.8441
LittleHopeLH2 2022-09-19 SH_T03 -35.268 -53.9455 1.6052 0.1008 77.5212
LittleHopeLH2 2022-09-19 SH_T04 -35.268 -51.2679 2.1473 0.1396 143.6091
LittleHopeLH2 2022-09-19 SH_T05 -35.268 -51.7021 2.6554 0.1022 129.9453
LittleHopeLH2 2022-09-19 SH_T06 -35.268 -54.6018 1.8994 0.0733 66.6485
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-29 SH_T01 -35.3193 -39.1118 1.0735 1.7379 589.9163
LittleHopeLH1 2022-09-29 SH_T02 -35.3193 -40.7823 1.1704 1.0851 401.5521
LittleHopeLH1 2022-09-29 SH_T03 -35.3193 -46.0643 1.2532 0.3003 119.0003
LittleHopeLH1 2022-09-29 SH_T04 -35.3193 -50.0771 0.9706 0.1539 47.2354
LittleHopeLH2 2022-09-29 SH_T06 -35.3193 -43.4678 0.6864 1.5598 313.0644
LittleHopeLH2 2022-09-29 SH_T07 -35.3193 -35.1855 1.1340 6.3577 2,107.9345
LittleHopeLH2 2022-09-29 SH_T08 -35.3193 -32.5255 1.0919 12.1828 3,889.2100
LittleHopeLH2 2022-09-29 SH_T09 -35.3193 -37.5554 1.1187 3.7342 1,221.4388
LittleHopeLH2 2022-09-29 SH_T10 -35.3193 -43.2585 1.1134 1.0091 328.5170
LittleHopeLH2 2022-09-29 SH_T11 -35.3193 -52.3124 0.9983 0.1400 40.8479
LittleHopeLH2 2022-09-29 SH_T12 -35.3193 -63.4820 0.8482 0.0126 3.1204
LittleHopeLH3 2022-09-30 SH_T14 -35.3193 -37.2683 0.5860 5.8776 1,179.2555
LittleHopeLH3 2022-09-30 SH_T15 -35.3193 -36.7164 1.1056 3.5371 1,339.0402
LittleHopeLH3 2022-09-30 SH_T16 -35.3193 -33.4378 1.1236 7.4046 2,848.7096
LittleHopeLH3 2022-09-30 SH_T17 -35.3193 -35.6984 1.1998 4.1204 1,692.7509
LittleHopeLH3 2022-09-30 SH_T18 -35.3193 -57.0366 1.0493 0.0346 12.4387
LittleHopeLH3 2022-09-30 SH_T19 -35.3193 -73.9589 0.3304 0.0022 0.2527
LittleHopeLH4 2022-09-30 SH_T21 -35.3193 -40.9174 1.0806 0.9151 269.0270
LittleHopeLH4 2022-09-30 SH_T22 -35.3193 -40.9141 1.1929 0.8296 269.2297
LittleHopeLH4 2022-09-30 SH_T23 -35.3193 -37.8232 1.3153 1.5330 548.5459
LittleHopeLH5 2022-09-29 BT_T02 -35.3193 -58.6330 1.7103 0.0241 12.9207
LittleHopeLH5 2022-09-29 BT_T03 -35.3193 -48.8020 2.1760 0.1821 124.2771
LittleHopeLH5 2022-09-29 BT_T04 -35.3193 -46.7928 2.6050 0.2416 197.3825
LittleHopeLH5 2022-09-29 BT_T05 -35.3193 -57.7634 2.3459 0.0215 15.7852
LittleHopeLH6 2022-09-29 BT_T07 -35.3193 -43.9332 1.7883 0.9326 541.0484
LittleHopeLH6 2022-09-29 BT_T08 -35.3193 -45.7594 2.4997 0.4381 355.3169
LittleHopeLH6 2022-09-29 BT_T09 -35.3193 -46.6578 2.4387 0.3652 288.9219
LittleHopeLH6 2022-09-29 BT_T10 -35.3193 -49.9944 2.6995 0.1530 134.0042
LittleHopeLH6 2022-09-29 BT_T11 -35.3193 -52.1531 2.6943 0.0933 81.5162
LittleHopeLH7 2022-09-30 BT_T14 -35.3193 -57.7467 0.6843 0.0613 10.2956
LittleHopeLH7 2022-09-30 BT_T15 -35.3193 -57.6234 1.1113 0.0388 10.5923
LittleHopeLH7 2022-09-30 BT_T16 -35.3193 -36.1968 1.2458 4.8080 1,471.1284
LittleHopeLH7 2022-09-30 BT_T17 -35.3193 -30.1532 1.3904 17.3240 5,915.7886
LittleHopeLH7 2022-09-30 BT_T18 -35.3193 -40.5545 1.5963 1.3758 539.3579
LittleHopeLH7 2022-09-30 BT_T19 -35.3193 -49.0419 1.3031 0.2388 76.4086
LittleHopeLH8 2022-09-29 AS_T01 -35.3193 -40.6739 3.1405 0.9088 486.5467
LittleHopeLH8 2022-09-29 AS_T02 -35.3193 -46.2215 3.4646 0.2296 135.6318
LittleHopeLH8 2022-09-29 AS_T03 -35.3193 -48.6889 3.1881 0.1414 76.8458
LittleHopeLH9 2022-09-30 AS_T04 -35.3193 -47.7421 2.2251 0.2167 238.6962
LittleHopeLH9 2022-09-30 AS_T05 -35.3193 -46.5004 2.6849 0.2390 317.6947
LittleHopeLH9 2022-09-30 AS_T06 -35.3193 -48.9989 1.8629 0.1938 178.7159
LittleHopeLH9 2022-09-30 AS_T07 -35.3193 -53.4858 1.6499 0.0779 63.6021
LittleHopeLH10 2022-09-30 E8_T01 -35.3193 -49.8779 1.2523 0.3100 148.0514
LittleHopeLH10 2022-09-30 E8_T02 -35.3193 -44.5393 2.3164 0.5730 506.1383
LittleHopeLH10 2022-09-30 E8_T03 -35.3193 -47.0972 1.4338 0.5137 280.8559
LittleHopeLH10 2022-09-30 E8_T04 -35.3193 -53.8939 1.4007 0.1099 58.7231
LittleHopeLH10 2022-09-30 E8_T05 -35.3193 -50.2599 0.8139 0.4369 135.5843
LittleHopeLH10 2022-09-30 E8_T06 -35.3193 -51.7934 1.2431 0.2009 95.2499
LittleHopeLH10 2022-09-30 E8_T07 -35.3193 -47.7032 1.0137 0.6319 244.2751
LittleHopeLH10 2022-09-30 E8_T08 -35.3193 -52.9131 1.2125 0.1592 73.6017
LittleHopeLH10 2022-09-30 E8_T09 -35.3193 -67.1317 0.4042 0.0181 2.7863
LittleHopeLH11 2022-09-30 E8_T11 -35.3193 -55.0470 0.4745 0.2203 27.3458
LittleHopeLH11 2022-09-30 E8_T12 -35.3193 -48.1450 0.9160 0.5590 133.9926
LittleHopeLH11 2022-09-30 E8_T13 -35.3193 -48.0222 1.8221 0.2891 137.8359
LittleHopeLH11 2022-09-30 E8_T14 -35.3193 -47.0641 1.6690 0.3935 171.8617
LittleHopeLH11 2022-09-30 E8_T15 -35.3193 -48.7235 1.0927 0.4102 117.2825
LittleHopeLH11 2022-09-30 E8_T16 -35.3193 -46.2483 1.5559 0.5094 207.3756
LittleHopeLH11 2022-09-30 E8_T17 -35.3193 -48.2008 1.3096 0.3860 132.2837
LittleHopeLH11 2022-09-30 E8_T18 -35.3193 -65.9306 0.9760 0.0087 2.2311
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-09-29 SH_T01 -35.3193 -39.1118 1.0735 1.7379 591.0298
LittleHopeLH1 2022-09-29 SH_T02 -35.3193 -40.7823 1.1704 1.0851 402.3101
LittleHopeLH1 2022-09-29 SH_T03 -35.3193 -46.0643 1.2532 0.3003 119.2249
LittleHopeLH1 2022-09-29 SH_T04 -35.3193 -50.0771 0.9706 0.1539 47.3246
LittleHopeLH2 2022-09-29 SH_T06 -35.3193 -43.4678 0.6864 1.5598 313.0644
LittleHopeLH2 2022-09-29 SH_T07 -35.3193 -35.1855 1.1340 6.3577 2,107.9345
LittleHopeLH2 2022-09-29 SH_T08 -35.3193 -32.5255 1.0919 12.1828 3,889.2100
LittleHopeLH2 2022-09-29 SH_T09 -35.3193 -37.5554 1.1187 3.7342 1,221.4388
LittleHopeLH2 2022-09-29 SH_T10 -35.3193 -43.2585 1.1134 1.0091 328.5170
LittleHopeLH2 2022-09-29 SH_T11 -35.3193 -52.3124 0.9983 0.1400 40.8479
LittleHopeLH2 2022-09-29 SH_T12 -35.3193 -63.4820 0.8482 0.0126 3.1204
LittleHopeLH3 2022-09-30 SH_T14 -35.3193 -37.2683 0.5860 5.8776 1,179.2555
LittleHopeLH3 2022-09-30 SH_T15 -35.3193 -36.7164 1.1056 3.5371 1,339.0402
LittleHopeLH3 2022-09-30 SH_T16 -35.3193 -33.4378 1.1236 7.4046 2,848.7096
LittleHopeLH3 2022-09-30 SH_T17 -35.3193 -35.6984 1.1998 4.1204 1,692.7509
LittleHopeLH3 2022-09-30 SH_T18 -35.3193 -57.0366 1.0493 0.0346 12.4387
LittleHopeLH3 2022-09-30 SH_T19 -35.3193 -73.9589 0.3304 0.0022 0.2527
LittleHopeLH4 2022-09-30 SH_T21 -35.3193 -40.9174 1.0806 0.9151 269.0270
LittleHopeLH4 2022-09-30 SH_T22 -35.3193 -40.9141 1.1929 0.8296 269.2297
LittleHopeLH4 2022-09-30 SH_T23 -35.3193 -37.8232 1.3153 1.5330 548.5459
LittleHopeLH8 2022-09-29 AS_T01 -35.3193 -40.6739 3.1405 0.9088 633.9016
LittleHopeLH8 2022-09-29 AS_T02 -35.3193 -46.2215 3.4646 0.2296 176.7090
LittleHopeLH8 2022-09-29 AS_T03 -35.3193 -48.6889 3.1881 0.1414 100.1193
LittleHopeLH9 2022-09-30 AS_T04 -35.3193 -47.7421 2.2251 0.2167 238.6962
LittleHopeLH9 2022-09-30 AS_T05 -35.3193 -46.5004 2.6849 0.2390 317.6947
LittleHopeLH9 2022-09-30 AS_T06 -35.3193 -48.9989 1.8629 0.1938 178.7159
LittleHopeLH9 2022-09-30 AS_T07 -35.3193 -53.4858 1.6499 0.0779 63.6021
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-10-10 BT_T01 -35.0778 -58.2903 1.6734 0.0250 12.0708
LittleHopeLH1 2022-10-10 BT_T02 -35.0778 -53.4662 2.2049 0.0575 36.6559
LittleHopeLH1 2022-10-10 BT_T03 -35.0778 -58.4683 1.7377 0.0231 11.5860
LittleHopeLH1 2022-10-10 BT_T04 -35.0778 -49.9227 1.5354 0.1868 82.8875
LittleHopeLH1 2022-10-10 BT_T05 -35.0778 -74.3768 1.5991 0.0006 0.2972
LittleHopeLH2 2022-10-11 BT_T07 -35.0778 -72.2323 0.4712 0.0017 0.1732
LittleHopeLH2 2022-10-11 BT_T08 -35.0778 -52.4149 0.6914 0.1107 16.6054
LittleHopeLH2 2022-10-11 BT_T09 -35.0778 -42.2966 0.8597 0.9149 170.6407
LittleHopeLH2 2022-10-11 BT_T10 -35.0778 -55.2041 0.9271 0.0434 8.7363
LittleHopeLH2 2022-10-11 BT_T11 -35.0778 -67.1362 0.9118 0.0028 0.5599
LittleHopeLH2 2022-10-11 BT_T12 -35.0778 -78.3904 0.2845 0.0007 0.0419
LittleHopeLH3 2022-10-11 BT_T15 -35.0778 -51.1004 1.0762 0.0849 26.2266
LittleHopeLH3 2022-10-11 BT_T16 -35.0778 -49.4531 1.1161 0.1196 38.3247
LittleHopeLH3 2022-10-11 BT_T17 -35.0778 -53.1410 0.8530 0.0669 16.3942
LittleHopeLH3 2022-10-11 BT_T18 -35.0778 -63.0786 0.6102 0.0095 1.6631
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2022-10-22 BT_T01 -35.1695 -40.9544 1.1053 0.9403 187.6384
LittleHopeLH1 2022-10-22 BT_T02 -35.1695 -40.8193 1.0032 1.0687 193.5658
LittleHopeLH1 2022-10-22 BT_T03 -35.1695 -44.7422 0.8291 0.5240 78.4408
LittleHopeLH1 2022-10-22 BT_T04 -35.1695 -59.7135 1.0000 0.0138 2.4970
LittleHopeLH2 2022-10-21 SH_T01 -35.1695 -74.3571 5.7608 0.0013 12.0353
LittleHopeLH2 2022-10-21 SH_T02 -35.1695 -64.2460 7.8902 0.0094 123.4706
LittleHopeLH2 2022-10-21 SH_T03 -35.1695 -64.1669 13.2466 0.0057 125.7411
LittleHopeLH2 2022-10-21 SH_T04 -35.1695 -67.0938 12.7110 0.0030 64.0899
LittleHopeLH2 2022-10-21 SH_T05 -35.1695 -66.2547 14.3225 0.0033 77.7503
LittleHopeLH2 2022-10-21 SH_T06 -35.1695 -71.3003 6.2937 0.0023 24.3300
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH2 2022-10-21 SH_T01 -35.1695 -74.3571 5.7608 0.0013 12.0353
LittleHopeLH2 2022-10-21 SH_T02 -35.1695 -64.2460 7.8902 0.0094 123.4706
LittleHopeLH2 2022-10-21 SH_T03 -35.1695 -64.1669 13.2466 0.0057 125.7411
LittleHopeLH2 2022-10-21 SH_T04 -35.1695 -67.0938 12.7110 0.0030 64.0899
LittleHopeLH2 2022-10-21 SH_T05 -35.1695 -66.2547 14.3225 0.0033 77.7503
LittleHopeLH2 2022-10-21 SH_T06 -35.1695 -71.3003 6.2937 0.0023 24.3300

Notes

No additional notes for this area.

Eastern Shore

Summary

Table. Summary of the 2022 Eastern Shore spawning ground acoustic survey data from all surveys and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Eastern Shore #1 2022-09-19 -35.6217 2 -38.80 1,093 341 31
Eastern Shore #2 2022-09-22 3 -35.6217 1 -38.28 4,423 135 26
Eastern Shore #3 2022-10-01 9 -35.9430 0 -33.07 428 223 52
Eastern Shore #4 2022-10-04 3 -35.5030 2 -41.94 15,057 104 23
Eastern Shore #5 2022-10-08 4 -35.5030 0 -43.99 69 20 29
Eastern Shore #6 2022-10-13 5 -35.9495 4 -43.02 768 172 22
Eastern Shore #7 2022-10-17 4 -35.7978 1 -40.50 833 80 31
Eastern Shore #8 2022-10-18 1 -35.7978 1 -35.95 702 212 30
Eastern Shore #9 2022-10-23 5 -35.5151 0 -43.30 56 45 80
Eastern Shore #10 2022-10-25 2 -35.5151 1 -45.31 148 97 66
Summary 1 -40.42 23,577 2,466 10

Table. Summary of the 2022 Eastern Shore spawning ground acoustic survey data and associated biomass estimates used towards an index of abundance. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Eastern Shore #1 2022-09-22 -35.6217 1 -38.28 4,423 135 26
Eastern Shore #2 2022-10-04 12 -35.5030 2 -41.94 15,057 104 23
Eastern Shore #3 2022-10-17 13 -35.7978 1 -40.50 833 80 31
Summary 1 -40.24 20,313 2,413 12

Length Frequency

Figure. Length distribution used for calculation of TS for the Eastern Shore acoustic surveys in 2022 with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Eastern Shore surveys in 2022 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2022 fish sampled for Eastern Shore by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target SESength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Eastern Shore #1 Sep - 19 1 1 31 222 278 164 -35.1722 169 -35.2302
Eastern Shore #2 3 Sep - 22 1 1 31 222 278 164 -35.1722 169 -35.2302
Eastern Shore #3 9 Oct - 1 4 3 39 489 285 186 -35.4935 176 -35.4215
Eastern Shore #4 3 Oct - 4 3 3 63 382 272 153 -35.0536 169 -35.2323
Eastern Shore #5 4 Oct - 8 3 3 63 382 272 153 -35.0536 169 -35.2323
Eastern Shore #6 5 Oct - 13 1 1 36 307 280 173 -35.3483 173 -35.3483
Eastern Shore #7 4 Oct - 17 1 1 36 307 280 173 -35.3483 173 -35.3483
Eastern Shore #8 1 Oct - 18 1 1 36 307 280 173 -35.3483 173 -35.3483
Eastern Shore #9 5 Oct - 23 1 1 34 193 273 154 -35.0657 169 -35.2436
Eastern Shore #10 2 Oct - 25 1 1 34 193 273 154 -35.0657 169 -35.2436

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2022 Eastern Shore acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Eastern Shore acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-09-19 ZP_T01 -35.6217 -53.8904 1.5274 0.1141 33.8740
EasternShoreES1 2022-09-19 ZP_T02 -35.6217 -51.6125 1.3642 0.2159 57.2346
EasternShoreES1 2022-09-19 ZP_T03 -35.6217 -52.4676 1.3574 0.1782 47.0053
EasternShoreES1 2022-09-19 ZP_T04 -35.6217 -46.1747 1.6402 0.6280 200.1897
EasternShoreES1 2022-09-19 ZP_T05 -35.6217 -43.4315 1.6407 1.1807 376.4969
EasternShoreES1 2022-09-19 ZP_T06 -35.6217 -45.9106 1.1292 0.9693 212.7369
EasternShoreES1 2022-09-19 ZP_T07 -35.6217 -47.2250 1.4774 0.5474 157.1822
EasternShoreES1 2022-09-19 ZP_T08 -35.6217 -60.0508 1.5622 0.0270 8.2003
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-09-22 VE_T01 -35.6217 -46.7656 0.1773 1.3252 74.2815
EasternShoreES1 2022-09-22 VE_T02 -35.6217 -46.2718 0.4061 0.6483 83.2274
EasternShoreES1 2022-09-22 VE_T03 -35.6217 -77.2003 0.1672 0.0013 0.0672
EasternShoreES1 2022-09-22 VE_T05 -35.6217 -49.1621 0.2460 0.5501 42.7794
EasternShoreES1 2022-09-22 VE_T06 -35.6217 -45.4540 0.2800 1.1353 100.4729
EasternShoreES1 2022-09-22 VE_T07 -35.6217 -47.2905 0.4114 0.5061 65.8254
EasternShoreES1 2022-09-22 VE_T08 -35.6217 -47.8580 0.4170 0.4381 57.7621
EasternShoreES1 2022-09-22 VE_T09 -35.6217 -46.2243 0.7166 0.3714 84.1432
EasternShoreES1 2022-09-22 VE_T10 -35.6217 -53.5318 0.2361 0.2095 15.6412
EasternShoreES2 2022-09-22 EA_T10 -35.6217 -55.1690 1.9153 0.1413 59.8099
EasternShoreES2 2022-09-22 EA_T09 -35.6217 -53.5821 1.5806 0.2467 86.1908
EasternShoreES2 2022-09-22 EA_T11 -35.6217 -57.5864 1.6612 0.0933 34.2789
EasternShoreES2 2022-09-22 EA_T12 -35.6217 -54.7442 1.9499 0.1530 65.9560
EasternShoreES2 2022-09-22 EA_T13 -35.6217 -58.0090 1.7032 0.0826 31.1006
EasternShoreES2 2022-09-22 EA_T14 -35.6217 -49.6348 2.4440 0.3959 213.8881
EasternShoreES2 2022-09-22 EA_T15 -35.6217 -45.9910 2.4809 0.9025 494.9546
EasternShoreES2 2022-09-22 EA_T16 -35.6217 -48.7920 1.7731 0.6625 259.7008
EasternShoreES2 2022-09-22 EA_T17 -35.6217 -49.9981 2.1435 0.4151 196.7235
EasternShoreES2 2022-09-22 EA_T18 -35.6217 -52.5015 2.0116 0.2486 110.5399
EasternShoreES2 2022-09-22 EA_T19 -35.6217 -57.4839 1.8002 0.0882 35.0980
EasternShoreES2 2022-09-22 EA_T20 -35.6217 -64.4214 1.0914 0.0294 7.1044
EasternShoreES2 2022-09-22 EA_T21 -35.6217 -48.1858 1.3109 1.0304 298.6028
EasternShoreES2 2022-09-22 EA_T22 -35.6217 -63.5005 0.5103 0.0778 8.7825
EasternShoreES3 2022-09-22 EA_T25 -35.6217 -52.2240 0.5343 0.1917 8.7428
EasternShoreES3 2022-09-22 EA_T26 -35.6217 -49.4549 0.6154 0.3150 16.5409
EasternShoreES3 2022-09-22 EA_T27 -35.6217 -43.1868 0.7496 1.0950 70.0438
EasternShoreES3 2022-09-22 EA_T28 -35.6217 -47.8921 0.9493 0.2926 23.7051
EasternShoreES3 2022-09-22 EA_T29 -35.6217 -56.7815 0.9449 0.0380 3.0613
EasternShoreES3 2022-09-22 EA_T30 -35.6217 -59.4088 0.8918 0.0220 1.6717
EasternShoreES4 2022-09-22 EA_T01 -35.6217 -48.8125 0.8024 0.2431 27.1542
EasternShoreES4 2022-09-22 EA_T02 -35.6217 -43.0018 0.8062 0.9223 103.4924
EasternShoreES4 2022-09-22 EA_T03 -35.6217 -44.8563 0.7795 0.6224 67.5248
EasternShoreES4 2022-09-22 EA_T04 -35.6217 -48.1809 0.8533 0.2644 31.4052
EasternShoreES4 2022-09-22 EA_T05 -35.6217 -46.8464 0.8260 0.3714 42.7024
EasternShoreES5 2022-09-22 ZP_T02 -35.6217 -61.8389 1.1470 0.0161 2.9614
EasternShoreES5 2022-09-22 ZP_T03 -35.6217 -40.7886 1.3797 1.7092 377.1552
EasternShoreES5 2022-09-22 ZP_T04 -35.6217 -43.9762 1.4170 0.7989 181.0359
EasternShoreES5 2022-09-22 ZP_T05 -35.6217 -41.8971 1.5773 1.1583 292.1986
EasternShoreES5 2022-09-22 ZP_T06 -35.6217 -43.5470 0.8789 1.4217 199.8424
EasternShoreES5 2022-09-22 ZP_T07 -35.6217 -50.0395 1.0470 0.2676 44.8159
EasternShoreES5 2022-09-22 ZP_T08 -35.6217 -51.1196 0.3028 0.7216 34.9481
EasternShoreES6 2022-09-22 ZP_T11 -35.6217 -62.8214 1.1477 0.0202 4.1031
EasternShoreES6 2022-09-22 ZP_T12 -35.6217 -45.6758 1.3318 0.9006 212.6508
EasternShoreES6 2022-09-22 ZP_T13 -35.6217 -51.2356 1.9072 0.1748 59.1134
EasternShoreES6 2022-09-22 ZP_T14 -35.6217 -49.5132 2.0586 0.2408 87.8875
EasternShoreES6 2022-09-22 ZP_T15 -35.6217 -53.1715 2.2540 0.0947 37.8531
EasternShoreES6 2022-09-22 ZP_T16 -35.6217 -52.2881 1.6735 0.1563 46.3916
EasternShoreES6 2022-09-22 ZP_T17 -35.6217 -56.2457 1.7707 0.0594 18.6499
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-01 VE_T01 -35.943 -53.1166 0.2909 0.1408 4.2381
EasternShoreES1 2022-10-01 VE_T02 -35.943 -51.9270 0.3644 0.1478 5.5735
EasternShoreES1 2022-10-01 VE_T03 -35.943 -42.3998 0.5335 0.9052 49.9870
EasternShoreES1 2022-10-01 VE_T04 -35.943 -37.9243 0.5456 2.4809 140.0888
EasternShoreES1 2022-10-01 VE_T05 -35.943 -35.7974 0.4016 5.4997 228.6103
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-04 EA_T01 -35.503 -47.7698 1.5036 0.2735 115.8573
EasternShoreES1 2022-10-04 EA_T02 -35.503 -46.7323 1.6015 0.3261 147.1230
EasternShoreES1 2022-10-04 EA_T03 -35.503 -48.2305 1.4038 0.2635 104.1970
EasternShoreES1 2022-10-04 EA_T04 -35.503 -49.9571 1.2478 0.1992 70.0157
EasternShoreES1 2022-10-04 EA_T05 -35.503 -60.2342 1.1740 0.0199 6.5688
EasternShoreES2 2022-10-04 EA_T09 -35.503 -72.6109 0.7507 0.0012 0.1078
EasternShoreES2 2022-10-04 EA_T10 -35.503 -50.4804 0.7753 0.1899 17.6120
EasternShoreES2 2022-10-04 EA_T11 -35.503 -43.8993 0.7604 0.8810 80.1521
EasternShoreES2 2022-10-04 EA_T12 -35.503 -39.0216 0.7876 2.6149 246.4251
EasternShoreES2 2022-10-04 EA_T13 -35.503 -43.4620 0.7576 0.9780 88.6441
EasternShoreES2 2022-10-04 EA_T14 -35.503 -42.4121 0.7990 1.1808 112.8849
EasternShoreES3 2022-10-04 ZP_T18 -35.503 -51.2641 1.7426 0.1473 80.3195
EasternShoreES3 2022-10-04 ZP_T19 -35.503 -41.3828 1.6571 1.5072 781.5391
EasternShoreES3 2022-10-04 ZP_T20 -35.503 -41.4760 2.1158 1.1554 764.9345
EasternShoreES3 2022-10-04 ZP_T21 -35.503 -40.4887 1.3145 2.3343 960.1836
EasternShoreES3 2022-10-04 ZP_T22 -35.503 -44.8612 1.2424 0.9025 350.8422
EasternShoreES3 2022-10-04 ZP_T23 -35.503 -72.9573 0.6910 0.0025 0.5439
EasternShoreES3 2022-10-04 ZP_T24 -35.503 -66.0751 0.9082 0.0093 2.6529
EasternShoreES4 2022-10-04 ZP_T01 -35.503 -56.8216 1.4256 0.1956 90.0742
EasternShoreES4 2022-10-04 ZP_T02 -35.503 -52.9251 1.4716 0.4649 220.9289
EasternShoreES4 2022-10-04 ZP_T03 -35.503 -49.8369 2.4530 0.5679 449.8596
EasternShoreES4 2022-10-04 ZP_T04 -35.503 -48.2284 2.8247 0.7142 651.5194
EasternShoreES4 2022-10-04 ZP_T05 -35.503 -47.3134 3.0108 0.8272 804.3128
EasternShoreES4 2022-10-04 ZP_T06 -35.503 -52.7983 2.7159 0.2593 227.4721
EasternShoreES4 2022-10-04 ZP_T07 -35.503 -54.8575 2.8015 0.1565 141.5840
EasternShoreES4 2022-10-04 ZP_T08 -35.503 -46.6943 3.3149 0.8664 927.5411
EasternShoreES4 2022-10-04 ZP_T09 -35.503 -41.6610 4.5030 2.0325 2,955.7383
EasternShoreES4 2022-10-04 ZP_T10 -35.503 -48.0245 4.8070 0.4398 682.8328
EasternShoreES4 2022-10-04 ZP_T11 -35.503 -45.1568 5.1375 0.7965 1,321.5470
EasternShoreES4 2022-10-04 ZP_T12 -35.503 -46.7128 1.4018 2.0402 923.5908
EasternShoreES4 2022-10-04 ZP_T13 -35.503 -54.5212 1.2386 0.3825 152.9832
EasternShoreES4 2022-10-04 ZP_T14 -35.503 -84.7429 0.6790 0.0007 0.1454
EasternShoreES5 2022-10-03 VE_T01 -35.503 -46.7752 0.5610 0.1859 15.2971
EasternShoreES5 2022-10-03 VE_T02 -35.503 -45.6572 0.5738 0.2351 19.7881
EasternShoreES5 2022-10-03 VE_T03 -35.503 -53.1899 0.2627 0.0906 3.4925
EasternShoreES6 2022-10-04 VE_T06 -35.503 -50.4731 0.3091 0.1582 8.8480
EasternShoreES6 2022-10-04 VE_T08 -35.503 -49.9734 0.4712 0.1164 9.9269
EasternShoreES6 2022-10-04 VE_T09 -35.503 -44.3282 0.7551 0.2665 36.4194
EasternShoreES7 2022-10-04 VE_T10 -35.503 -49.7704 1.3357 0.2592 110.8993
EasternShoreES7 2022-10-04 VE_T11 -35.503 -45.5327 1.0380 0.8850 294.2435
EasternShoreES7 2022-10-04 VE_T12 -35.503 -42.5337 1.8012 1.0173 586.9581
EasternShoreES7 2022-10-04 VE_T13 -35.503 -45.5083 1.8346 0.5035 295.9013
EasternShoreES7 2022-10-04 VE_T14 -35.503 -49.5539 1.2380 0.2940 116.5678
EasternShoreES7 2022-10-04 VE_T15 -35.503 -51.7876 1.3563 0.1604 69.6962
EasternShoreES7 2022-10-04 VE_T16 -35.503 -60.9058 0.6447 0.0413 8.5387
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-08 ZP_T01 -35.503 -66.3840 0.4636 0.0090 0.3963
EasternShoreES1 2022-10-08 ZP_T02 -35.503 -50.8769 0.7668 0.1938 14.0861
EasternShoreES1 2022-10-08 ZP_T03 -35.503 -48.9032 0.9190 0.2548 22.1898
EasternShoreES1 2022-10-08 ZP_T04 -35.503 -49.7024 0.9805 0.1987 18.4601
EasternShoreES1 2022-10-08 ZP_T05 -35.503 -51.8462 1.0053 0.1183 11.2681
EasternShoreES1 2022-10-08 ZP_T06 -35.503 -58.7102 0.9875 0.0248 2.3198
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-13 VE_T01 -35.9495 -51.8061 1.4159 0.1714 101.5942
EasternShoreES1 2022-10-13 VE_T02 -35.9495 -46.0661 3.2774 0.2776 380.9444
EasternShoreES1 2022-10-13 VE_T03 -35.9495 -48.5862 2.6159 0.1947 213.2342
EasternShoreES1 2022-10-13 VE_T04 -35.9495 -53.4476 1.6700 0.0996 69.6171
EasternShoreES1 2022-10-13 VE_T05 -35.9495 -67.5132 0.3659 0.0178 2.7300
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-17 ZP_T01 -35.7978 -52.3012 0.8359 0.1646 16.9167
EasternShoreES1 2022-10-17 ZP_T02 -35.7978 -46.3928 1.0400 0.5156 65.9410
EasternShoreES1 2022-10-17 ZP_T03 -35.7978 -45.9276 1.0577 0.5643 73.3966
EasternShoreES1 2022-10-17 ZP_T04 -35.7978 -45.1903 1.2183 0.5805 86.9768
EasternShoreES1 2022-10-17 ZP_T05 -35.7978 -54.7997 1.1164 0.0693 9.5162
EasternShoreES1 2022-10-17 ZP_T06 -35.7978 -59.4656 0.8812 0.0300 3.2500
EasternShoreES2 2022-10-17 ZP_T09 -35.7978 -63.1557 0.4167 0.0220 0.9451
EasternShoreES2 2022-10-17 ZP_T10 -35.7978 -58.7769 0.6172 0.0408 2.5904
EasternShoreES2 2022-10-17 ZP_T11 -35.7978 -44.2996 0.6962 1.0140 72.6278
EasternShoreES2 2022-10-17 ZP_T12 -35.7978 -53.4232 0.6868 0.1258 8.8866
EasternShoreES2 2022-10-17 ZP_T13 -35.7978 -42.9554 0.9292 1.0354 98.9737
EasternShoreES2 2022-10-17 ZP_T14 -35.7978 -50.9620 0.9165 0.1661 15.6625
EasternShoreES2 2022-10-17 ZP_T15 -35.7978 -62.6888 0.7376 0.0139 1.0524
EasternShoreES3 2022-10-17 ZP_T18 -35.7978 -50.0692 1.7517 0.2136 91.5155
EasternShoreES3 2022-10-17 ZP_T19 -35.7978 -53.3071 1.7876 0.0993 43.4217
EasternShoreES3 2022-10-17 ZP_T20 -35.7978 -58.4869 0.9279 0.0581 13.1743
EasternShoreES3 2022-10-17 ZP_T21 -35.7978 -63.5356 1.1956 0.0141 4.1196
EasternShoreES3 2022-10-17 ZP_T22 -35.7978 -51.2079 1.5231 0.1890 70.4093
EasternShoreES3 2022-10-17 ZP_T23 -35.7978 -49.8207 1.2180 0.3253 96.9066
EasternShoreES3 2022-10-17 ZP_T24 -35.7978 -52.5014 0.8167 0.2617 52.2738
EasternShoreES3 2022-10-17 ZP_T25 -35.7978 -62.9124 0.7859 0.0247 4.7553
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-18 EA_T01 -35.7978 -52.9978 0.6853 0.1464 13.8545
EasternShoreES1 2022-10-18 EA_T02 -35.7978 -49.2831 0.7288 0.3237 32.5882
EasternShoreES1 2022-10-18 EA_T03 -35.7978 -43.0296 0.7133 1.3959 137.5325
EasternShoreES1 2022-10-18 EA_T04 -35.7978 -42.3603 0.8282 1.4024 160.4483
EasternShoreES1 2022-10-18 EA_T05 -35.7978 -42.5835 0.9564 1.1536 152.4117
EasternShoreES1 2022-10-18 EA_T06 -35.7978 -41.4211 0.6877 2.0968 199.1859
EasternShoreES1 2022-10-18 EA_T07 -35.7978 -56.8552 0.6639 0.0622 5.6996
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-23 ZP_T01 -35.5151 -57.3949 0.4889 0.0415 2.1973
EasternShoreES1 2022-10-23 ZP_T02 -35.5151 -52.5029 0.7256 0.0863 6.7779
EasternShoreES1 2022-10-23 ZP_T03 -35.5151 -55.3838 0.7929 0.0407 3.4915
EasternShoreES1 2022-10-23 ZP_T04 -35.5151 -59.1855 0.5699 0.0236 1.4549
EasternShoreES1 2022-10-23 ZP_T05 -35.5151 -44.5317 0.5508 0.7123 42.4832
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2022-10-25 VE_T01 -35.5151 -69.3799 0.9909 0.0018 0.5789
EasternShoreES1 2022-10-25 VE_T02 -35.5151 -46.0435 1.2891 0.2926 124.8106
EasternShoreES1 2022-10-25 VE_T03 -35.5151 -54.1604 1.3026 0.0447 19.2560
EasternShoreES1 2022-10-25 VE_T04 -35.5151 -62.2482 0.6770 0.0134 2.9908

Notes

No additional notes for this area.

About

This report was generated on: 2023-08-09 12:13:43
dplyr R package version 1.1.2
kableExtra R package version 1.3.4
ggplot2 R package version 3.4.2
DT R package version 0.28
R version 4.2.0 Patched (2022-05-30 r82437 ucrt)